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AssigneeFuji Xerox Co., Ltd.
InventorsHidemi Nukada, Akihiko Tokida, Yasuo Sakaguchi, Katsumi Daimon, Katsumi Nukada
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A process for preparing a titanyl phthalocyanine crystal showing at least one diffraction peak at a Bragg angle (2.theta..+-.0.2) of 27.3.degree. is disclosed, which comprises dissolving or suspending titanyl phthalocyanine in concentrated sulfuric acid to form a solution or a slurry and diluting the solution or slurry with an alcohol solvent, an aromatic solvent, a mixed solvent of an alcohol solvent and water, a mixed solvent of an aromatic solvent and water, or a mixed solvent of an alcohol solvent and an aromatic solvent with or without water thereby to precipitate a crystal, and, if desired, treating the precipitated crystal with an alcohol solvent, an aromatic solvent, a mixed solvent of an alcohol solvent and an aromatic solvent or a mixed solvent of an alcohol solvent and/or an aromatic solvent and water. The resulting titanyl phthalocyanine crystal exhibits high photosensitivity and excellent durability as a photoconductive material of an electrophotographic photoreceptor.
A process for preparing a photoconductive titanyl phthalocyanine crystal for use in an electrophotographic photoreceptor, wherein said crystal shows at least one diffraction peak at a Bragg angle (2.theta..+-.0.2) of 27.3.degree. and said at least one peak at a Bragg angle of 27.3.degree. is the strongest diffraction peak, said process comprising the step of dissolving or suspending titanyl phthalocyanine in concentrated sulfuric acid to form a solution or a slurry and diluting said solution or slurry with a solvent so as to precipitate a crystal in said solvent, wherein said solvent is an alcohol solvent having up to 5 carbon atoms, an aromatic solvent, a mixed solvent of said alcohol solvent and water, a mixed solvent of said aromatic solvent and water, or a mixed solvent of said alcohol solvent and said aromatic solvent with or without water;
A process for preparing a photoconductive titanyl phthalocyanine crystal for use in an electrophotographic photoreceptor, wherein said crystal shows at least one diffraction peak at a Bragg angle (2.theta..+-.0.2) of 27.3.degree. and said at least one peak at a Bragg angle of 27.3.degree. is the strongest diffraction peak, said process comprising the steps of
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